Enhancement in carbon monoxide sensing performance by reduced graphene oxide/trimanganese tetraoxide system

• Published in: Sensors and actuators. B, Chemical Vol. 325; p. 128749
• Main Authors: John, Neetha, Abraham, K.E.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15-12-2020; Elsevier Science Ltd
• Subjects: Carbon monoxide; Gas sensors; Graphene; Humidity; Manganese oxides; Morphology; Nanocomposites; Operating temperature; Recovery time; Response time; Room temperature; Sensors; Mn3O4; Anodic aluminum oxide; Gas sensor; Reduced graphene oxide; CO
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2020.128749

•Uniform morphology of rGO-Mn3O4 system on AAO template.•rGO-Mn3O4 sensor produced enhanced sensing towards CO especially at 25 °C in humid background.•Response time and recovery time of the fabricated sensor is much improved for sensing gases at room temperature.•The fabricated sensor is showing good reproducibility.•Fabrication of low cost and environmental friendly sensor to sense CO at 100 °C and 200 °C.
The article reports enhanced sensing response of reduced graphene oxide (rGO)-trimanganese tetraoxide (Mn3O4) nanocomposite gas sensor towards carbon monoxide (CO) at 298 K in a humid background. The outstanding performance of this sensor is mainly due to its high gas absorbing nature owing to uniform morphology and increased conductivity of rGO-Mn3O4 network. The sensor exhibits high sensitivity, good stability, quick response and rapid recovery. Furthermore, rGO-Mn3O4 sensor is showing better response time and reduced recovery time. The sensor response time for 50 ppm of CO is 3 s at 298 K, whereas for 20 ppm, it is 8 s. Gas sensing response at room temperature is around 70 % for 50 ppm of CO. The sensor also showed enhanced sensing at 473 K for low concentration (4 ppm of CO) with response time of 2 s and recovery time 5 s, respectively. Humidity independent sensor signal along with reduced response time, especially at a low operating temperature makes this sensor a very promising material for CO detection in conditions of variable humidity.